Spring hinge



July 5, 1932- J. G. MITCHELL SPRING HINGE Filed July 6, 1951 2 lSheets-Sweet l .Il ll lllll 2 Sheets-Sheet I 2 Figfz J' MWC/hef) IAA/eu Tall mlm/M J. G. MITCHELL SPRING HINGE Filed July Ve, 1951 Fig.5

Fig.8

July 5, 1932.

Patented July 5, 1932 Y JAMES GAnli MITCHELL, on BnLr'AsT; NORTHERN IRELAND r A I l;

Y .Appnation inea July'e,f1931,j`seriai 54a0l69g ianjay yin Great Bitaiaru'1i5,' 1.9364. f l

-i This-invention has orjits objectftoVprovide'improved v spring hinges for doorsgand the like, wherein the controlling spring' or springs isl or are made readily accessibleandf capable of being removed and replaced with'- out dismounting the door In the two accompanying sheets of eX- planatory drawings Figure l is a part sectional frontv elevation showing one application of the invention to a double acting spring door hinge, and Figure 2 is an end view of the hinge.

Figure 3 is a plan of the hinge, and F igure 4 a sectional plan on the line 1.2. Figure 1.

Figure 5 is a plan showing one application of the invention to a single acting hinge. Figures 6 and 7 are opposite end views of this hinge, and-Figure 8 is a front elevation of the same.

In carrying the invention into eectas shown in Figures 1 4, I employ a body part a and a pair of plates b. Each plate is adapted to be attached by screws or other fasten# ings to one edge of a door c or its frame d. Also each plate b is formed with a plurality of knuckles n, and along each end the body part a is formed with knuckles p; It will be noticed that the knuckles at one end of the body part alternate with those at the other end. Transversely across the body, which has both ends exposed, opposite each knuckle notch is formed a cylindrical chamber f. Each chamber at one end is intersected by the knuckle notch, and at the other end is open. Into each chamber are inserted a thimble g which can bear against a flat face on theadjacent knuckle, a helical spring 7L, and a hollow plug z' which is screwed into the open end of the chamber for holding the spring and thimble in position. The outer end of the plug is notched transversely for engagement by a screw driver, or is otherwise adapted for plug in position or withdrawing it.

The plate knuckles are attached to the v when the hinge is in a closed position, the

convenient manipulation when placing the end portions of'the-pinsf'being vsecured by "screwthreads as shown. In theexampleil-` lustrated,eachplate'is attached to the body part by three coaxial pins, arranged so; that springsli'e between thek adj acent ends of each in' air. WVhen the dooris opened in'one direction thel plate kattachedto the door moves relativelyto the body p`art,'and when vthe door ismoved` in the other direction this plate and' 60 the body part move together -relatively'to the plate attached to the frame;A EIt is desirable to prevent relative'movement ofthe body part and one of the plates 'in'each direction of movement I therefore provide inV a'not-ch d6 in the upperend,or lower end, or both, of the body part,v a slidableA locking piece il:` whichc'an" engage arecess Z in either ofthe adjacent kncklesof the plates, the portion of the knuckle near'the recess serving as a cam i6 for moving the locking' piece.' Lookingat Figure3, if `'the door is moved to the right, the right hand knuckle will move the locking piecel into engagement' with* the left,V hand knuckle, and'so prevent movement of `the 1'6 body part relatively tothe plate attached to the frame. In the vposition'shown the lock# ing piece engages the r`right handl knuckle, and if; the door were moved tothe left, the left j hand' knuckle would hold the locking piece 80 in this position thereby'preventing relative movement between the, body part and the plate attached to thedooi.' 5 i f Theesse'ntial feature of my present invention resides in the arrangement of the spring chambers, so ythatie'ach;spring is readily accessible. vInthe event ofa kspring vbreaking it can easily bereplaced by removing the end Y plug, without detachingthehinge from the door. j j ,90

In the application'A of the invention tosingle acting -hin'gesas shown in'Figures 5 8, a p air of main partsare used.' One of them consists of aplate m 'which at oneedge is v formed with knuckles The other consists of a body part o formed with knuckles p, and also withfattachment lugs g. :Within the body part is formed a chamber containing a thimblclv1 which can co-operate with one of the knuckles rlhe thimbleis acted on by 10 a strong spring t, and the spring is held in position by a hollow plug u. The knuckles Vn, p are interconnected by a single pivot pin s.

The part m is attached by screws o to, for example, the frame w of the door, and the part 0 is attached by screws to the door itself, as shown inFignre L Themode .of attachmegntofhthe to the door is such 'as leaves the end containing the plug u freely accessible. If at any time it is required't replace the spring', this can donewithout fdismounting the door. y

While only vone chamber and spring are shown in the exampleaboyedescribed, the body part may, if' desired, be" made Wide enough to accommodateIt-wo or more of such chambers and .springs, but in all cases the end4 of the body containing the plugs @4 is `expQSed Se@ es t0, sreesss it@ ,the Springs with: out disturbing the connection of the hinge ivith the door.

While primarily intended for doors, the v hinges 'above l described lmay be applied arto other analogous uses,V Also tlie invention is not .limited Ato the example illustrated as sub- 1,see,21s Y jacent to a knuckle, removable closure devices at the outerends of the chambers a helical spring in each chamber, and knuckled plates pivotally attached to opposite ends of the body part so as to lie in planes parallel to the plane of the latter when in a closed position, ,the on either plate being arranged ,t0 alterni@ Wifi Q11. the' other plate, substantially as described.

4.".[11 spring hinges as claimed in claim 3,

the with thebody part, of a slidable lookin piece for interengaging either plateirith t e body part When relative movement occurs between .the ,bodyhpart and the other plate, each plate 'being adapted to be engaged by onecndif the lach-11g Piece and toserveias a cam for moving the saidpiece, substantiallyas described.

In Vstimonyhave signed AMES GARTH MITCHELL;

ordinate details may be varied to suit different requirements i; s.

s Having this described myieventon what claim; slnewuanddesire to `secure by Letters Patent il c V1. In sp r1ng -the combination kilikld andhinsedlylwnneted parts. ar: ffl-aged i0. lie in .Parallel planes 'when na Closelrostom a :Spring-@emailing Cha-mf said partsgwhcheihas bet-h endSeXpoSed, so that one rend ofthe chamberis' Vaccessible for the: insertion of a spring,` While theother -end berarranged transversely .across one oi?` theY ofthe chamber is situated adjacentfto va I f knuckle A oninth'enother hinge part, a thirnble in said chamber acting on the said knuckle,

-lieeal Ceutrllins .Spr-inem the ,Chamber acting en tl'ehimble; and a removable @le sure device inserted in the accessible end of the chambersoas to form a seating for said spring, substantially as described.V y

l 2. [n springhinges, the combination of knuckled and hingedly connected parts arrangedtolie iniparallel planes when in a closed position, spring containing chambers arranged transversely across one Vof the .said parts, Whichhaveboth ends exposed, a thinly-k` ble in one end of each chamber bearing againsta knuckle onthe other part, a helicalv controlling spring in each chamber acting, at one end on the thimble, a screwed plug inthe other'end of each chamber acting on the other endvof the spring, substantially as described'. A In spring hinges of the kind specified, the` combination of a body partformed with spring containing chambers lying across v,the body part which have both ends exposed, so

that` one end of the chamber is accessible forv 

